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Sediment toxicity

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In accordance with Column 2 of REACH Annex X, the long-term toxicity to sediment organisms (required in section 9.5.1.) does not need to be conducted as the results of the chemical safety assessment do not indicate the need to investigate further the effects of the substance on sediment organisms. The substance is not classified as hazardous for environmental effects and the available data are adequate for classification and labelling purposes. Furthermore, a PBT assessment is not required for inorganic substances so no further testing is required.  This understanding is confirmed in the TDp test (IUCLID section 5.6). Here, one of the components (manganese) within the compound is only seen at a concentration of 15.9 µg/L (after 28 days from 1 mg/L loading). Since the registered substance is a metal oxide, any ionic metal leaching out of this compound (considered very unlikely) is predicted to bind strongly to soil and sediments. On this basis the bioavailable concentration of Mn from manganese dioxide to sediment dwelling organisms is predicted to be much less than the background concentration of manganese in European sediments (452 mg Mn/kg).

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